Thermostat



Marchvzz 192s. 1,663,566

G. G. ROYER THERMOSTAT Filed Feb. 6. 1926 I @tu fr @Y ig/uu #06% Patented Mar. 27, 1928.

UNITED STATES 1,663,566 PATENT oFFlcE.

GEORGES GASTON BOYER, F PARIS, FRANCE.

THERMOSTAT.

Griginal application filed Hay 8, 1925, Serial No. 28,871, and in Canada Hay 12, 1925. Divided and this application led February This invention relates to improvements in thermostats.

It is one of the primary objects of the invention to provide a durable, 'uniformly acting thermostat which will have great strength and at the same time be extremely- The figure is a longitudinal sectional viewoithe present embodiment of the invention. Referring to the details of the apparatus,

the body part or casing of the thermostat is shown in the present instance as formed of a tube or casing 5 forming an enclosed thermostatic chamber 4 which obviously may be forlned'of any desired shape or proportions. The casing 5 is closed at its upper end by a stopper G provided with a milled head and maintained Huid-tight therein by soldering or other suitable means. The stopper 6 is preferably provided with avent 7 obturated by a peg forced in after the tube 5 has been filled with an inert substance as described below. The numeral 9 indicates a plunger slidably mounted with respect to the casing 5 and provided with an inner head 8 against which one end of a coiled compression spring 10 abuts. The plunger 9 is maintained in fluid-tight relation to the casing 5 by means of a stuiiing box comprising a plastic packing material 11 which surrounds the plunger and is engaged with the '10 casing 5. A metallic cap or Washer 12 preferably surrounds the plunger 9 and rests upon the packing material 11, the cap 12 being engaged by the outer end of the coiled spring 10. The spring thus acts in conjunction with the pressure Within the chamber 4 to maintain the packing material in tight sealed relation with the body of the plunger 9, the spring also exerting an-inward tendency on the plunger 9 for further preventing G0 air being drawn into the thermostatic chamber during contraction et the thermostatic fluid. The plunger 9 is sealed with respect to the casing 5througli the packing material 11 only since the plunger body and head 8 move freely in the casing 5, being pref- 6, 1926. Serial No. 86,440.

erably maintained out of contact with the y particular liquid of being substantially non-- compressible and having a relatively low point of fusion preventing the same from freezing at any usual temperatures. The packing material 11 preferably consists of a Ymolded Abi-conical washer formed of compressible anti-acid indiarubber. To prevent leakage of the glycerine or other thermostatic material through the joint formed between the plunger 9 and casing 5 a little solid grease lnay be applied below the joint to obstruct alloutlet. The outer end ot' the plunger 9 may have any desired form of operating element 13 for operating the'device or devices to be controlled by the thermostat.

It will be seen that according to the construction disclosed, when there is an increase of temperature and a consequent expansion of the Huid in the chamber 4, a pressure is developed within the casing 5 and the plunger 9 is pushed outwardly from the casing 5., since the plunger is the only displaceable element through which the pressure in the chamber' 4 may be. relieved. Likewise upon a decrease in the temperature of the thermostat with a resultant contraction of the volume of the thermostatic material or glycerine in the chamber 4, the plunger is drawn inwardly into the chamber of the thermostat in an obvious manner. The spring 1() compresses the packing material 1l so as to maintain a tight seal between the plunger 9 and casing 5, the spring further assisting in drawing the plunger into the chamber 4 and preventing air from -being drawn into this chamber whena contraction of the thermostatic material occurs.

It is to be understood that the thermostat may be made of diiferent form and, proportions thau those shown in the drawing and may be used in any desired location for controlling or operating any preferred type of vmechanism. Cnc such use 1s disclosed in my United States application for patent, Serial No. 28,871, of which the present application is a division. It. is also to be understood that the thermostatic substance within the chamber 4 may be changed without de- -parting from my invention as different liuids or liquids or even powder will produce useful results although I prefer the use of the liquid specified, and further that the scope of the invention is to be ascertained from the appended claims.

I claim as my invention:

1. A thermostat comprising a Huid container, a pressure responsive rod extending through the wall of said container, a packing ring surrounding said rod adjacent said Wall and means disposed on said rod for compressing said packing ring in proportion to the increase in pressure developed in said container.

2. A thermostat comprising a fluid con-` said container, a packing ring surrounding lsaid rod adjacent said Wall, a head on the extremity of said rod and means interposed between said packing member and said head disposed on said rod for opposing the movement of said rod by an increase in pressure in said container and for compressing said packing ring upon movement of said rod.

4. A thermostat comprising a fluid container, a rod extending` through the wall of said container, a packing ring surrounding said rod adjacent said wall, a head on the extremity of said rod and a spring interposed between said packing member and said head disposed on said rod for opposing the movement of said rod by an increase in pressure in said container and for compressing1 said packing ring upon movement of said IO( 5. A thermostat comprising a tubular fluid container, means for hermetically sealing one end ot' said container, a movable plunger extending through the other end of said container, a packing ring surrounding said plunger at the joint Where it passes through the Wall ot' said container and means for forcing said packing ring against the end of said container as said plun er is displaced by the pressure develope in said container.

In testimony whereof I have aliixed my signature. A

GEORGES GASTON ROYER. 

